Efficient schemes of millimeter wave FEM-oscillator and amplifier

The paper is devoted to progress in the experimental study of FEM with a guide magnetic field based on a linear induction accelerator (1 MeV/200 A/200 ns). In a Bragg FEM-oscillator a mode pattern in the resonators for different Q-factors was studied both theoretically and experimentally. In accordance with theoretical predictions single-frequency operation in a low Q-factor resonator and multifrequency operation in a high Q-factor resonator were observed. Under an optimal resonator configuration at a frequency of 31 GHz a single-mode generation with a power of 37 MW and an efficiency of 26% was obtained. A new wideband scheme of RF-input based on the effect of microwave beam multiplication was studied in the FEM-amplifier experiment. At the present stage at a frequency of 36.4 GHz amplification of 20 dB was obtained.